Here is one way to do it.  You use a :var to "run" the other block.

#+NAME: create-file
#+begin_src bash :results silent
cat << EOF > main.txt
foo
bar
EOF
#+end_src

#+BEGIN_SRC python :var run=create-file
with open('main.txt') as f:
    print(f.read())
#+END_SRC

#+RESULTS:
: foo
: bar
:

John

-----------------------------------
Professor John Kitchin
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu



On Mon, Feb 15, 2021 at 4:01 PM Rodrigo Morales <
moralesrodrigo1100@gmail.com> wrote:

>
> Is it possible to associate a code block (A) to another code block (B)
> so that when (A) is executed (B) is executed beforehand? I'm asking this
> because I have a bash code block (B) that creates a file that is then
> processed by a python code block (A) so before executing (A) block, the
> file needs to be created by (B).
>
> I managed to accomplish this only with shell code blocks by creating a
> function that gets a code block as an string but now that code blocks
> have different languages (bash and python) I can't use this same
> approach. Recall that ":prologue" inserts an string at the beginning of
> the code block (see minimal working example of this idea below.)
>
> #+NAME: create-file
> #+begin_src bash :results silent
> cat << EOF > main.txt
> foo
> bar
> EOF
> #+end_src
>
> #+HEADER: :prologue (org-babel-get-block-as-string "create-file")
> #+begin_src bash
> cat main.txt
> #+end_src
>
> #+RESULTS:
> #+begin_example
> foo
> bar
> #+end_example
>
> --
> Rodrigo Morales.
> IRC: rdrg109 (freenode)
>
>